/*
 * Copyright 2004-2005 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sf.jml;

import net.sf.jml.protocol.MsnMessage;

/**
 * MsnMessage iterator.
 * 
 * @author Roger Chen
 */
public interface MsnMessageIterator {

    /**
     * Has previous MsnMessage.
     * 
     * @return
     * 		has previous MsnMessage
     */
    boolean hasPrevious();

    /**
     * Get the previous MsnMessage.
     * 
     * @return
     * 		previous MsnMessage
     */
    MsnMessage previous();
}